Scroll-type fluid machine

Abstract

A scroll-type fluid machine is provided with a body unit having a fixed scroll and a turning scroll. Each of the fixed and turning scrolls include a lap formed on an end plate. The scroll-type fluid machine further includes a motor unit having a drive shaft for driving the body unit, rotors, and a stator. Cooling fins are formed on the opposite surfaces of the fixed scroll and the turning scroll from the surfaces of the respective end plates where the laps are formed.

The invention claimed is: 
     
       1. A fluid machine comprising:
 a body unit which has a fixed scroll having a lap formed on an end plate thereof, a turning scroll having a lap formed on an end plate thereof to face the lap of the fixed scroll, and a body casing which accommodates the fixed scroll and the turning scroll; and 
 a motor unit which has a drive shaft connected to the body unit to drive the body unit, a rotor rotating integrally with the drive shaft, a stator which imparts a rotational force to the rotor, and a motor casing which accommodates the drive shaft, the rotor and the stator, 
 a first cooling fin formed on a surface opposite to a surface on which the lap of the end plate is formed; 
 a second cooling fin formed on the fixed scroll; and 
 a third cooling fin formed on the turning scroll, wherein
 a heat generation amount of the fixed scroll and the turning scroll are defined as Qc, 
 a heat generation amount of the stator is defined as Qs, and 
 Qc/4≤Qs≤Qc is satisfied; and 
 a radial dimension of the end plate of the fixed scroll is defined as α, 
 an axial dimension from a tip of the second cooling fin of the fixed scroll to a tip of the third cooling fin of the turning scroll is defined as lc, 
 a radial dimension of the motor casing is defined as Dm, 
 an axial dimension of the stator is defined as ls, and 
 α/8+lc/4≤ls≤α/2+lc is satisfied under the condition of α=Dm. 
 
 
     
     
       2. The fluid machine according to  claim 1 , further comprising:
 a forth cooling fin formed on an outer side in a radial direction of the motor casing, and the tip of the fourth cooling fin of the motor casing is disposed on the outer side in the radial direction than an outermost circumferential surface of the lap formed on the fixed scroll. 
 
     
     
       3. The fluid machine according to  claim 1 , wherein
 a turning bearing configured to support the drive shaft with respect to the turning scroll is disposed on a side closer to the motor unit than the end plate of the turning scroll. 
 
     
     
       4. The fluid machine according to  claim 1 , further comprising:
 a fifth cooling fin provided at an end portion of the drive shaft opposite to the body unit. 
 
     
     
       5. The fluid machine according to  claim 4 , wherein
 an outer circumferential surface of the motor unit is cooled by cooling air flowing from the body unit side to the fifth cooling fin. 
 
     
     
       6. The fluid machine according to  claim 4 , wherein
 an outer circumferential surface of the motor unit is cooled by cooling air flowing from the fifth cooling fin to the body unit side. 
 
     
     
       7. The fluid machine according to  claim 1 , wherein
 the rotor and the stator are axially opposed to each other. 
 
     
     
       8. The fluid machine according to  claim 1 , wherein
 the body unit and the motor unit are attachably and detachably fastened between the body casing and the motor casing by a fastening member. 
 
     
     
       9. The fluid machine according to  claim 1 , wherein
 a radial dimension of the motor casing is longer than the axial dimension.